Abstract
Published data on survival of T2 gallbladder carcinoma (GBC) from different countries show a wide range of 5-year survival rates from 30–> 70%. Recently, studies have demonstrated substantial variation between countries in terms of their approach to sampling gallbladders, and furthermore, that pathologists from different continents apply highly variable criteria in determining stage of invasion in this organ. These findings raised the question of whether these variations in pathologic evaluation could account for the vastly different survival rates of T2 GBC reported in the literature. In this study, survival of 316 GBCs from three countries (Chile n = 137, South Korea n = 105, USA n = 74), all adequately sampled (with a minimum of five tumor sections examined) and histopathologically verified as pT2 (after consensus examination by expert pathologists from three continents), was analyzed. Chilean patients had a significantly worse prognosis based on 5-year all-cause mortality (HR: 1.89, 95% CI: 1.27–2.83, p = 0.002) and disease-specific mortality (HR: 2.41, 95% CI: 1.51–3.84, p < 0.001), compared to their South Korean counterparts, even when controlled for age and sex. Comparing the USA to South Korea, the survival differences in all-cause mortality (HR: 1.75, 95% CI: 1.12–2.75, p = 0.015) and disease-specific mortality (HR: 1.94, 95% CI: 1.14–3.31, p = 0.015) were also pronounced. The 3-year disease-specific survival rates in South Korea, the USA, and Chile were 75%, 65%, and 55%, respectively, the 5-year disease-specific survival rates were 60%, 50%, and 50%, respectively, and the overall 5-year survival rates were 55%, 45%, and 35%, respectively. In conclusion, the survival of true T2 GBC in properly classified cases is neither as good nor as bad as previously documented in the literature and shows notable geographic differences even in well-sampled cases with consensus histopathologic criteria. Future studies should focus on other potential reasons including biologic, etiopathogenetic, management-related, populational, or healthcare practice-related factors that may influence the survival differences of T2 GBC in different regions.
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All authors agreed with the content and gave explicit consent to submit this work. All authors made substantial contributions to the conception, design, case acquisition, analysis, and interpretation of data, and assisted with drafting and revising the work, approving the version to be published. The authors agree to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved. This study involved 3 continents and investigators from 5 countries and entailed the collection and detailed re-review of clinical and pathology findings in hundreds of gallbladder cancer patients, with multiple consensus meetings held in Santiago, Chile; Atlanta, USA; and Seoul, Korea. Each investigator contributed significantly in multiple ways as outlined below:
NVA, JK, JCR, MDR, OB, and JYJ conceived the study and designed the approach and analytic methods along with MSDS and MG. Case procurement for study, case organization, and collection of clinical information including survival data were performed by JMS and SKM from the USA, HFL and JCA from Chile, and JYJ, KTJ, and SHM from Korea. Initial histopathologic review in different continents was conducted by SMH, KL, HK, HJC, and KTJ (Korean cases), NVA, BP, BM, MDR, and OB (for cases from the USA), and JCA, JCR, and EB (for Chilean cases). The international pathology consensus meetings were organized and coordinated by JCR (in Santiago, Chile), JCA (in Temuco, Chile), JYJ and KTJ (in Seoul, Korea), and NVA and JK (in Atlanta, USA), and the working group that conducted the re-review of the pathology material included JYJ, SKL, HK, HJC, SMH, and KTJ, from Korea, NVA, OB, MDR, JK, from the USA, and JCR, JCA, EB, and HL from Chile. TM, BP, and BM performed the organization of the combined international data. MSD, BP, BM, MDR, TM, OB, JK, and NVA conducted the literature analysis and organization of the manuscript. Statistical analysis was performed by MG, MSDS, JK, and SB. MSDS, MG, OB, MDR, JK, and NVA prepared the manuscript draft. All authors of this paper have critically reviewed the intellectual content and approved the final version submitted.
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DeSimone, M.S., Goodman, M., Pehlivanoglu, B. et al. T2 gallbladder cancer shows substantial survival variation between continents and this is not due to histopathologic criteria or pathologic sampling differences. Virchows Arch 478, 875–884 (2021). https://doi.org/10.1007/s00428-020-02968-5
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DOI: https://doi.org/10.1007/s00428-020-02968-5